Valent Controls IOM 67 IOM-C1-0616
Part Number 474626
9. HEATING – ELECTRIC HEAT
9.1. The electric heater shall modulate capacity in order to maintain the supply air temperature setpoint.
10. HEATING – TEMPERATOR
10.1. The electric heater shall modulate capacity in order to maintain the supply air temperature setpoint.
10.2. If the SCR electric heater is unable to maintain the supply air temperature setpoint, the unit controller shall disable
the SCR electric heater and enable the indirect gas furnace.
10.3. In heating mode the unit controller shall perform the following actions.
A. Enable indirect gas furnace.
B. Modulate capacity to maintain the supply air temperature setpoint.
10.4. When an enable signal is received from the unit controller, the furnace controller shall initiate the following ignition
sequence.
A. Enable the combustion blower at full speed for 15 seconds on 110/210/310 casings and 30 seconds on 350
casings.
B. Modulate the gas valve to 100% on 110/210/310 casings and 55% on 350 casing furnace.
C. Enable the spark igniter for 10 seconds on 110/210/310 casings and 5 seconds on 350 casings.
D. Hold the ignition modulation setpoint for 30 seconds on 110/210/310 casings and 120 seconds for 350 casings.
10.5. Once the ignition sequence is complete, the furnace controller shall perform the following actions.
A. Modulate the gas valve based on the modulation signal from the unit controller.
B. Lower and raise the speed of the combustion fan based on the modulation signal from the unit controller (two-
speed).
10.6. If the furnace controller does not receive confirmation of a successful ignition sequence (flame providing switch not
made), it shall initiate the ignition sequence two additional times on 110/210/310 casings and three additional times
on 350 casings.
10.7. Upon the loss of the enable signal from the unit controller, the furnace controller shall perform the following actions.
A. Modulate the gas valve to 0%.
10.8. Increase the combustion blower to full speed for 30 seconds on 110/210/310 casings and 60 seconds for 350
casings.
11. HEATING – WATER SOURCE HEAT PUMP
11.1. In heating mode the controller shall perform the following functions.
A. Enable the Digital Scroll™ compressor and modulate capacity to maintain supply air temperature setpoint.
B. If the Digital Scroll™ compressor is not able to maintain the supply air temperature, additional fixed stages of
capacity shall be enabled and the Digital Scroll™ shall continue to modulate to maintain the supply air
temperature setpoint.
C. If the combination of multiple compressors provides too much cooling capacity, the controller shall disable fixed
stages of capacity and continue to modulate the Digital Scroll™ compressor to maintain the supply air
temperature setpoint.
11.2. To maintain a consistent condensing temperature in heating mode the controller shall modulate the water valve on
each circuit to maintain a condensing temperature of 110°F.
12. HEATING – AIR SOURCE HEAT PUMP
12.1. In heating mode the controller shall perform the following functions.
A. Enable the Digital Scroll™ compressor and modulate capacity to maintain supply air temperature setpoint.
B. If the Digital Scroll™ compressor is not able to maintain the supply air temperature, additional fixed stages of
capacity shall be enabled and the Digital Scroll™ shall continue to modulate to maintain the supply air
temperature setpoint.
C. If the combination of multiple compressors provides too much cooling capacity, the controller shall disable fixed
stages of capacity and continue to modulate the Digital Scroll™ compressor to maintain the supply air
temperature setpoint.
D. Enable condensing fans at full speed.
12.2. [No Defrost Mode] If the unit is not capable of meeting the supply air temperature setpoint the controller shall disable
all refrigeration and enable the mechanical heating source.
12.3. [DefrostPLUS] The controller shall initiate a defrost sequence to remove the accumulation of frost build up on the
outdoor coil.
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